Charging base unit



FIG. 1 is a front perspective view of a charging base unit;

FIG. 2 is a bottom perspective view of the charging base unit;

FIG. 3 is a side view thereof taken from the side illustrated in FIG. 1;

FIG. 4 is a side view of the side opposite that illustrated in FIG. 3;

FIG. 5 is a top view thereof;

FIG. 6 is a bottom view thereof;

FIG. 7 is a front view thereof; and,

FIG. 8 is a rear view thereof. 

The ornamental design for a charging base unit, as shown and described. 